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EP1114241B1 - Bague d'etancheite pour joints de fluides non hermetiques - Google Patents

Bague d'etancheite pour joints de fluides non hermetiques Download PDF

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Publication number
EP1114241B1
EP1114241B1 EP00958132A EP00958132A EP1114241B1 EP 1114241 B1 EP1114241 B1 EP 1114241B1 EP 00958132 A EP00958132 A EP 00958132A EP 00958132 A EP00958132 A EP 00958132A EP 1114241 B1 EP1114241 B1 EP 1114241B1
Authority
EP
European Patent Office
Prior art keywords
sealing
sealing ring
cutting element
sealing rib
rib
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00958132A
Other languages
German (de)
English (en)
Other versions
EP1114241A1 (fr
Inventor
Herbert Hoffelner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTU Aero Engines AG
Original Assignee
MTU Aero Engines GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTU Aero Engines GmbH filed Critical MTU Aero Engines GmbH
Publication of EP1114241A1 publication Critical patent/EP1114241A1/fr
Application granted granted Critical
Publication of EP1114241B1 publication Critical patent/EP1114241B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
    • F01D11/122—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with erodable or abradable material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/445—Free-space packings with means for adjusting the clearance

Definitions

  • the invention relates to a sealing ring for non-hermetic fluid seals with a throttled passage between coaxial, relatively rotating Dichtungselemeriten, according to the preamble of claim 1.
  • Sealing rings of this type are preferably used in labyrinth seals of gas turbine engines to form in cooperation with a coaxial, usually static inlet lining a fluidic throttle point and thus to keep adjacent, gasbeetzschlagte spaces at different operating pressures. It is customary to provide such sealing rings with a plurality of axially successively arranged sealing ribs, which are commonly referred to in professional circles as "sealing fins". Especially in large engines large relative movements occur in the axial and radial directions between the sealing fins and the inlet lining, wherein the sealing fins penetrate radially into the inlet lining and these wear over a certain axial length.
  • DE 4341 216 C2 protects a sealing component for gap or labyrinth seals with a coating of a composite of metal and hard particles, the latter being arranged in the form of regularly shaped bodies with leveled surfaces lying on the same level.
  • This design is intended to cause the Einlaufbelagmaterial is not only removed by abrasion but also displaced by hot plastic flow. However, this requires a strong heat generation by friction, which in turn can damage the Fintechnikstoff.
  • DE 197 30 008 C1 protects an armor for a metallic engine component, which incorporates when rubbed into an inlet lining, comprises a ceramic layer and is profiled with tips and intermediate spaces for discharging abrasive material, the profiling by reshaping the surface of the component before Coating is formed, preferably by knurling.
  • the entire Dichtfin is performed in the manner of a saw blade with a plurality of evenly distributed over its circumference teeth whose surfaces are coated with ceramic.
  • This solution has u.a. the disadvantage that the many clearances between the teeth / tips generally worsen the sealing effect.
  • the object of the invention is to make a sealing ring for non-hermetic fluid seals, especially for labyrinth seals in gas turbine engines, on the one hand a fast, abrasive, thermally and mechanically problem-free inlet operation and on the other hand a good, reproducible and calculable sealing effect, in conjunction with a suitable, mechanically abradable inlet lining.
  • the sealing ring according to the invention advantageously combines the features of a conventional design with at least one smooth rotationally symmetrical Sealing rib and an abrasive embodiment, wherein only one or a few discrete points of the sealing rib one or a few cutting elements are arranged, which protrude from the sealing rib contour.
  • the cutting elements should be really cutting or machined and robust, ie mechanically resistant, executed so that in a short time and without much friction enough plaque material is removed, the desired gap for smooth, sealing contour of the sealing rib is formed.
  • machining a method known as "thread whirling" is known and uses a rapidly rotating hollow tool with one or a few inwardly projecting teeth to machine a slowly rotating workpiece. Although the tool and the workpiece during thread whirling are not guided coaxially with each other, this method gives some idea of the running-in process of a sealing ring according to the invention.
  • preferred embodiments of the invention are characterized.
  • the sealing ring 1 comprises a - at least largely - rotationally symmetrical support 3, which is fixedly connected to at least one adjacent, rotating component (not shown).
  • their free edges 8,9 are largely smooth and rotationally symmetric, ie circular cylindrical.
  • only one sealing rib or more than two sealing ribs can be arranged on a carrier, that the free edges of at least two sealing ribs can be stepped in the diameter, that is to say of different sizes, and that all or part of the sealing ribs can also project radially inward from the carrier.
  • the dashed contours 11, 12 indicate cutting elements and their rotation paths. It can be seen that the cutting elements 11, 12 project radially and on both sides axially over the sealing rib contours. This ensures that the sealing ribs 5,6 even including their free, sealing edges 8,9 almost never come into contact with the opposite inlet lining 17 so that measures such as surface hardening, armor etc. can be dispensed with as a rule.
  • the inlet lining 17, shown as a dashed line as an adjacent, static sealing element, is embodied - as in practice - as a metallic honeycomb structure whose material should be relatively easy to remove by machining, ie should have a certain ductility and a defined fracture behavior.
  • Figure 2 shows in detail different embodiments of cutting elements 13 to 16 on a sealing ring 2 with a radially outer sealing rib 7 on a support 4, wherein the free, sealing edge 10 facing upward.
  • a plate-shaped cutting element 13 which is arranged axially / radially, ie transversely to the sealing rib 7 and passing therethrough. It can be seen that the cutting element 13 radially (upwards) and both sides axially (right front and left rear) from the sealing rib contour protrudes.
  • the cutting geometry is not shown in detail, it being left to the skilled person to provide here suitable angle, Spanleit- and chip breaking devices.
  • the cutting element 13 will usually consist of a harder material than the sealing rib 7, preferably made of hard metal, ceramic or a material composite based thereon. Depending on the material is a form-fitting complementary, cohesive connection, eg by soldering or gluing, useful. It also recognizes a relief hole 19, which is to prevent dangerous notch stresses in the sealing fin material at the foot of the cutting element 13. For sealing reasons, the relief hole 19 may be closed, for example with a plug, with glue or solder.
  • the left second cutting element 14 is also plate-shaped, but its arrangement is radial and substantially circumferentially on one side of the sealing rib 7 in a pocket-like depression.
  • the one-sided arrangement requires that at least a pair of such cutting elements 14 are arranged per sealing rib, wherein these are axially opposite or can be offset in the circumferential direction.
  • the left third cutting element 15 differs from the first cutting element 13 by its wedge shape, wherein the axial / radial arrangement is the same.
  • the wedge shape leads to a positive fixation in the radial direction, so that a reliable protection against centrifugal forces is given. A cohesive additional fixation is at best effective against axial migration.
  • the wedge shape also causes a "pulling" cut of the two side cutting edges. Voltage-effective relief geometries in the region of the two lower, by the sealing rib 7 leading Keel corners may be present, but are not shown here.
  • the right cutting element 16 has the peculiarity of a purely positive fastening. For this purpose, it is circular-cylindrical in the foot area, rectangular in the cutting / head area. Its installation in the sealing ring 2 takes place radially from the inside by plugging. Safeguards against falling inside may be appropriate (not shown).
  • a cutting element of this type has admittedly the disadvantage that it reduces the supporting component cross section locally relatively strong, so that the support of the sealing ring must be more strongly dimensioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (4)

  1. Bague d'étanchéité pour joints de fluides non hermétiques, comportant un passage étranglé entre éléments d'étanchéité coaxiaux, tournant les uns par rapport aux autres, formant en particulier un élément d'étanchéité rotatif pour joints à labyrinthe dans les mécanismes moteurs de turbines à gaz,
    comportant un support menant à au moins un élément de construction, au moins une nervure d'étanchéité s'étendant radialement vers l'extérieur ou vers l'intérieur ainsi qu'autour du support entier, et dont l'arête tournante libre forme au cours du fonctionnement, avec une couche de rodage lui faisant face radialement, un point d'étranglement selon la technique des fluides,
    la nervure d'étanchéité présentant, sur une grande partie de son périmètre, un contour uni à symétrie de révolution et, en direction de la couche de rodage, une géométrie abrasive,
    caractérisée en ce qu'
    en un seul point ou en des points discontinus de la (de chaque) nervure d'étanchéité (5,6,7), est disposé à chaque fois un élément de coupe (11,12,13,14,15,16) de telle manière qu'il fasse saillie radialement et axialement d'un côté ou des deux côtés, à partir du contour de la nervure d'étanchéité (5,6,7).
  2. Bague d'étanchéité selon la revendication 1,
    caractérisée en ce qu'
    un élément de coupe (11, 12, 13, 15, 16) ou une paire d'éléments de coupe (14) se faisant face axialement est chaque fois disposé en un à quatre points, et de préférence en deux points diamétralement opposés, de la nervure d'étanchéité (5,6,7)
  3. Bague d'étanchéité selon la revendication 1 ou 2,
    caractérisée en ce que
    chaque élément de coupe (11,12,13,14,15,16) est assemblé mécaniquement et/ou matériellement (par exemple par brasage ou collage) avec la nervure d'étanchéité (5,6,7).
  4. Bague d'étanchéité selon une ou plusieurs des revendications 1 à 3,
    caractérisée en ce que
    chaque élément de coupe (11,12,13,14,15,16) est constitué de métal (en particulier de métal dur), de métal revêtu de céramique ou de céramique.
EP00958132A 1999-07-16 2000-07-14 Bague d'etancheite pour joints de fluides non hermetiques Expired - Lifetime EP1114241B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19933445A DE19933445C2 (de) 1999-07-16 1999-07-16 Dichtring für nicht- hermetische Fluiddichtungen
DE19933445 1999-07-16
PCT/DE2000/002309 WO2001006097A1 (fr) 1999-07-16 2000-07-14 Bague d'etancheite pour joints de fluides non hermetiques

Publications (2)

Publication Number Publication Date
EP1114241A1 EP1114241A1 (fr) 2001-07-11
EP1114241B1 true EP1114241B1 (fr) 2006-06-14

Family

ID=7915057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958132A Expired - Lifetime EP1114241B1 (fr) 1999-07-16 2000-07-14 Bague d'etancheite pour joints de fluides non hermetiques

Country Status (6)

Country Link
US (1) US6478304B1 (fr)
EP (1) EP1114241B1 (fr)
JP (1) JP4500476B2 (fr)
CA (1) CA2353686C (fr)
DE (2) DE19933445C2 (fr)
WO (1) WO2001006097A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015217670A1 (de) 2015-09-15 2017-03-16 Rolls-Royce Deutschland Ltd & Co Kg Dichtungselement, Dichtungssystem mit einem Dichtungselement, Turbomaschine mit einem Dichtungssystem und Verfahren zur Herstellung eines Dichtungselements

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US6805530B1 (en) * 2003-04-18 2004-10-19 General Electric Company Center-located cutter teeth on shrouded turbine blades
US6890150B2 (en) * 2003-08-12 2005-05-10 General Electric Company Center-located cutter teeth on shrouded turbine blades
US6905309B2 (en) * 2003-08-28 2005-06-14 General Electric Company Methods and apparatus for reducing vibrations induced to compressor airfoils
US7094023B2 (en) * 2004-02-09 2006-08-22 United Technologies Corporation Shroud honeycomb cutter
US7341426B2 (en) * 2004-12-29 2008-03-11 United Technologies Corporation Gas turbine engine blade tip clearance apparatus and method
US20070045966A1 (en) * 2005-08-31 2007-03-01 Caterpillar Inc. Coatings for metal-metal seal surfaces
FR2893359A1 (fr) * 2005-11-15 2007-05-18 Snecma Sa Lechette annulaire destinee a un laryrinthe d'etancheite, et son procede de fabrication
FR2893358A1 (fr) * 2005-11-15 2007-05-18 Snecma Sa Piece thermomecanique de turbomachine de revolution autour d'un axe longitudinal, comprenant une lechette annulaire, et son procede de fabrication
FR2893357B1 (fr) * 2005-11-15 2011-05-06 Snecma Lechette annulaire destinee a un labyrinthe d'etancheite et son procede de fabrication
US20100122620A1 (en) * 2008-11-18 2010-05-20 Pacific Saw And Knife Company Llc Circular saw blade with thermal barrier coating
DE102008061800A1 (de) * 2008-12-11 2010-06-17 Rolls-Royce Deutschland Ltd & Co Kg Segmentierte Dichtlippen für Labyrinthdichtungsringe
DE102009055913A1 (de) * 2009-11-27 2011-06-09 Rolls-Royce Deutschland Ltd & Co Kg Labyrinthdichtung aus in eine Einlaufschicht eingreifenden Dichtringen
US8500390B2 (en) * 2010-05-20 2013-08-06 Pratt & Whitney Canada Corp. Fan case with rub elements
US20120027573A1 (en) * 2010-08-02 2012-02-02 General Electric Company Seal teeth for seal assembly
ES2773743T3 (es) * 2011-12-13 2020-07-14 Mtu Aero Engines Gmbh Paleta que tiene un conjunto de nervaduras con un recubrimiento abrasivo
DE102016211337A1 (de) * 2016-06-24 2017-12-28 MTU Aero Engines AG Verdickter radial äußerer Ringbereich eines Dichtfins
FR3072121B1 (fr) * 2017-10-06 2021-07-30 Safran Aircraft Engines Dispositif d'etancheite entre rotor et stator de turbomachine
FR3073595B1 (fr) 2017-11-15 2020-02-07 Safran Helicopter Engines Joint a labyrinthe comprenant une lechette dotee d'un deflecteur

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015217670A1 (de) 2015-09-15 2017-03-16 Rolls-Royce Deutschland Ltd & Co Kg Dichtungselement, Dichtungssystem mit einem Dichtungselement, Turbomaschine mit einem Dichtungssystem und Verfahren zur Herstellung eines Dichtungselements
EP3144568A1 (fr) 2015-09-15 2017-03-22 Rolls-Royce Deutschland Ltd & Co KG Élement d'etancheite, systeme d'etancheite comprenant un element d'etancheite, turbomachine comprenant un element d'etancheite et procede de production d'un element d'etancheite

Also Published As

Publication number Publication date
JP2003505634A (ja) 2003-02-12
WO2001006097A1 (fr) 2001-01-25
US6478304B1 (en) 2002-11-12
DE19933445C2 (de) 2001-12-13
DE19933445A1 (de) 2001-02-01
EP1114241A1 (fr) 2001-07-11
CA2353686A1 (fr) 2001-01-25
JP4500476B2 (ja) 2010-07-14
DE50012978D1 (de) 2006-07-27
CA2353686C (fr) 2010-04-06

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